I upcycled a pie safe for fabric. Perfect depth. A bolt of fabric lies flat, FQs and jelly rolls stack two deep.
I also watch for sales and coupons for these decorative storage boxes from Joann Fabrics. They come in all sizes. One size is perfect for a 12.5” block. Also a way I keep in progress. BOM fabric and blocks all in one place. Perfect to stack on the metal shelf I confiscated from DH’s workshop.
https://www.joann.com/large-decorati...torage&start=1